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A007340 Numbers n such that both the harmonic and arithmetic means of the divisors of n are integers.
(Formerly M4299)
+0
10
1, 6, 140, 270, 672, 1638, 2970, 6200, 8190, 18600, 18620, 27846, 30240, 32760, 55860, 105664, 117800, 167400, 173600, 237510, 242060, 332640, 360360, 539400, 695520, 726180, 753480, 1089270, 1421280, 1539720, 2229500, 2290260, 2457000 (list; graph; listen)
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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.


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